Adds the dev-only Release page: a flag-gated route (config('clusev.release_controls'),
enforced by the component mount() guard) and a flag-gated sidebar item, plus the
Release Livewire component. Deploy-to-Staging is irreversible, so it goes through the
shared R5 wire-elements/modal confirm — confirmDeployStaging opens the modal and
applyDeployStaging consumes the sealed ConfirmToken and runs the deployStaging executor
(the host bridge writes the request, betaN is computed host-side). Registers the
releaseStaged confirm action in the ConfirmToken allow-list.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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